For me, this is the pièce de résistance of RAC/FRP. Can it be more emphasized that newcomers shouldn't get discouraged by it's initial abstractness. Can we add something that entices users to seek "enlightenment" of what this means.

I don't remember which specific essay, but Paul Graham did a hell of a job selling Lisp and macros, he sold it so that the promise was greater than the barriers of entry. Do we need to sell signals a bit more?